Although it is used to describe an ant lion who builds conical mounds to trap it's prey and the dung beetle who lays its eggs in little balls of cow pies then rolls them backwards to who knows where, oilfield workers know this term as describing a person who is in the oil exploration business. Mainly seismic crews.

"Some doodlebugs use dynamite to find oil and others use vibrators". "Those damn doodlebuggers tore up my cottonfield with their trucks again"